After attending Harrow School, from the early 1990s Zak was a derivatives broker at various companies such as Sucden, Union Cal (later part of Man Group) and Berkeley Futures.

In 2000 the opportunities afforded by the internet and the growth of Technical Analysis in the UK led to Zak being Shares Magazine’s first Technical Editor.
Since then he has written for Yahoo! Finance, the Investors Chronicle, Spectator Money, CNBC Bloomberg and Share Talk, as well as currently being Digital Communications Officer at main board listed LSE food technology group BigDish.